As Homunculus has stated, there could be a tax (and possibly NI) liability:
https://www.gov.uk/expenses-and-bene...ments/overview
Unless you can demonstrate that it is Work-related Training, and your employer funds it or re-imburses you, in which case it may be exempt from tax and NI.
"Work-related" includes any training course or other activity designed to impart, instil, improve or reinforce any knowledge, skills or personal qualities which are likely to prove useful or better qualify the employee to perform his job
https://www.gov.uk/government/public...ursed-training
Training and course fees
I can't see that the CAA have any input into a purely financial arrangement between you, your employer (and the taxman).
SD